ac_create_prefix_config_h

* this is a new variant from ac_prefix_config_ this one will use a lowercase-prefix if the config-define was starting with a lowercase-char, e.g.

  #define const or #define restrict or #define off_t

(and this one can live in another directory, e.g. testpkg/config.h therefore I decided to move the output-header to be the first arg)

takes the usual config.h generated header file; looks for each of the generated "#define SOMEDEF" lines, and prefixes the defined name (ie. makes it "#define PREFIX_SOMEDEF". The result is written to the output config.header file. The PREFIX is converted to uppercase for the conversions.

 - default OUTPUT-HEADER = $PACKAGE-config.h
 - default PREFIX = $PACKAGE
 - default ORIG-HEADER, derived from OUTPUT-HEADER

        if OUTPUT-HEADER has a "/", use the basename
        if OUTPUT-HEADER has a "-", use the section after it.
        otherwise, just config.h

In most cases, the configure.in will contain a line saying

        AC_CONFIG_HEADER(config.h)

somewhere *before* AC_OUTPUT and a simple line saying

       AC_PREFIX_CONFIG_HEADER

somewhere *after* AC_OUTPUT.

example:

  AC_INIT(config.h.in)        # config.h.in as created by "autoheader"
  AM_INIT_AUTOMAKE(testpkg, 0.1.1)   # "#undef VERSION" and "PACKAGE"
  AM_CONFIG_HEADER(config.h)         #                in config.h.in
  AC_MEMORY_H                        # "#undef NEED_MEMORY_H"
  AC_C_CONST_H                       # "#undef const"
  AC_OUTPUT(Makefile)                # creates the "config.h" now
  AC_CREATE_PREFIX_CONFIG_H          # creates "testpkg-config.h"
        and the resulting "testpkg-config.h" contains lines like
  #ifndef TESTPKG_VERSION
  #define TESTPKG_VERSION "0.1.1"
  #endif
  #ifndef TESTPKG_NEED_MEMORY_H
  #define TESTPKG_NEED_MEMORY_H 1
  #endif
  #ifndef _testpkg_const
  #define _testpkg_const const
  #endif

  and this "testpkg-config.h" can be installed along with other
  header-files, which is most convenient when creating a shared
  library (that has some headers) where some functionality is
  dependent on the OS-features detected at compile-time. No
  need to invent some "testpkg-confdefs.h.in" manually. :-)

AC_DEFUN([AC_CREATE_PREFIX_CONFIG_H],
[changequote({, })dnl
ac_prefix_conf_OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)`
ac_prefix_conf_DEF=`echo _$ac_prefix_conf_OUT | sed -e 'y:abcdefghijklmnopqrstuvwxyz./,-:ABCDEFGHIJKLMNOPQRSTUVWXYZ____:'`
ac_prefix_conf_PKG=`echo ifelse($2, , $PACKAGE, $2)`
ac_prefix_conf_LOW=`echo _$ac_prefix_conf_PKG | sed -e 'y:ABCDEFGHIJKLMNOPQRSTUVWXYZ-:abcdefghijklmnopqrstuvwxyz_:'`
ac_prefix_conf_UPP=`echo $ac_prefix_conf_PKG | sed -e 'y:abcdefghijklmnopqrstuvwxyz-:ABCDEFGHIJKLMNOPQRSTUVWXYZ_:'  -e '/^[0-9]/s/^/_/'`
ac_prefix_conf_INP=`echo ifelse($3, , _, $3)`
if test "$ac_prefix_conf_INP" = "_"; then
   case $ac_prefix_conf_OUT in
      */*) ac_prefix_conf_INP=`basename $ac_prefix_conf_OUT`
      ;;
      *-*) ac_prefix_conf_INP=`echo $ac_prefix_conf_OUT | sed -e 's/[a-zA-Z0-9_]*-//'`
      ;;
      *) ac_prefix_conf_INP=config.h
      ;;
   esac
fi
changequote([, ])dnl
if test -z "$ac_prefix_conf_PKG" ; then
   AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
else
  AC_MSG_RESULT(creating $ac_prefix_conf_OUT - prefix $ac_prefix_conf_UPP for $ac_prefix_conf_INP defines)
  if test -f $ac_prefix_conf_INP ; then
    AC_ECHO_MKFILE([/* automatically generated */], $ac_prefix_conf_OUT)
changequote({, })dnl
    echo '#ifndef '$ac_prefix_conf_DEF >>$ac_prefix_conf_OUT
    echo '#define '$ac_prefix_conf_DEF' 1' >>$ac_prefix_conf_OUT
    echo ' ' >>$ac_prefix_conf_OUT
    echo /'*' $ac_prefix_conf_OUT. Generated automatically at end of configure. '*'/ >>$ac_prefix_conf_OUT

    echo 's/#undef  *\([A-Z_]\)/#undef '$ac_prefix_conf_UPP'_\1/' >conftest.sed
    echo 's/#undef  *\([a-z]\)/#undef '$ac_prefix_conf_LOW'_\1/' >>conftest.sed
    echo 's/#define  *\([A-Z_][A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_UPP"_\\1 \\" >>conftest.sed
    echo '#define '$ac_prefix_conf_UPP"_\\1 \\2 \\" >>conftest.sed
    echo '#endif/' >>conftest.sed
    echo 's/#define  *\([a-z][A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_LOW"_\\1 \\" >>conftest.sed
    echo '#define '$ac_prefix_conf_LOW"_\\1 \\2 \\" >>conftest.sed
    echo '#endif/' >>conftest.sed
    sed -f conftest.sed $ac_prefix_conf_INP >>$ac_prefix_conf_OUT
    echo ' ' >>$ac_prefix_conf_OUT
    echo '/*' $ac_prefix_conf_DEF '*/' >>$ac_prefix_conf_OUT
    echo '#endif' >>$ac_prefix_conf_OUT
changequote([, ])dnl
  else
    AC_MSG_ERROR([input file $ac_prefix_conf_IN does not exist, dnl
    skip generating $ac_prefix_conf_OUT])
  fi
  rm -f conftest.*
fi])

Copyright © 2006 Guido U. Draheim <guidod@gmx.de>

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